Abrasive cutoff machine



Jan. 27, 1948.

R. B. PEALER 2,435,156

ABRAS IVE CUT OFF MACHINE 4 Sheets-Sheet}.

Filed Oct. 6, 1945 IN VEN TOR.

7W0, /ZM/ Jan. 27, 1948. R. B. PEALER ABRASIYE CUT-OFF MACHINE a Filed Oct. 6, 1945 4 Sheets-Sheet 2 mm} 7 m 2mm W140 Jan. 27, 1948. A R 2,435,156

ABRAS IVE CUT-OFF MACHINE Filed Oct. 6, 1945 4 Sheets-Sheet s.

- INVENTOR.

Jan. 27, 1948. R. B. 'PEALER I 2,435,156

ABRAS IVE CUT-OFF MACHINE Filed 00 1,. a, 1945 4 Sheets-Sheet 4 INVENTOR. 9 #89 Patented Jan. 27, 1948 ABRASIVE CUTOFF MACHINE Robert B. Pealer, Garrettsville, Ohio, assignor to Beaver Pipe Tools, Inc., Warren, Ohio, a corporation of Ohio Application October 6, 1945, Serial No. 620,754

2 Claims.

This invention relates to an abrasive cut-oil machine of the type which has a base carrying means for positioning the Work to be cut off, an

arm pivotally carried by the base, a motor mounted on the arm and an abrasive disc oper ated by the motor. The general object of the invention is to provide such a machine in an extremely simple and at the same time eificient form.

Among the particular objects of the invention are provision for efficient gearing between the motor shaft and the disc to give proper speed to the disc; provision of means for quenching the sparks resulting from the abrasion; provision of a suitable operating handle and electric switch adjacent the handle for convenient operation, and provision of a suitable gauge to locate readily the work to be cut. These various features will be hereinafter more fully described in connection with a preferred embodiment illustrated in the drawings.

In the drawings, Fig. 1 is a front elevation of my machine; Fig. 2 is an elevation partly in section looking at the left hand end of Fig. 1; Fig. 3 is a plan of the machine partly broken away; Fig. 4 is an elevation of the casing for the disc and gearing; Fig. 5 is a section on a larger scale through the axis of the disc shaft; Fig. 6 is a face view of the clamp for the disc; Fig. 7 is a perspective of the trough for carrying quenching liquid.

I will first describe the general characteristics of the machine shown in the drawing and then take up the particular features with which my invention is concerned.

In the drawings, l indicates a base of special form as hereinafter described in detail; 2!] an arm pivoted at the rear to the base so as to be movable in a vertical plane; 36 a motor carried by the arm and 40 an abrading disc rotated by the motor. Mounted in the base is a spring device 50 acting upwardly, as hereinafter explained, against the arm, and counter-balancing the weight of the motor and arm to maintain the arm normally in its uppermost position, as indicated in Fig. 2. The arm is provided with a handle 60 adapted to be grasped by the operator, who may at the same time operate an electric switch to energize the motor and then swing the motor and rotating disc downwardly to bring the disc into engagement with the work held by the operators other hand in a work positioner l i, carried by the base.

I Will now describe more specifically the construction of the different elements outlined.

The base l0 comprises a substantially rectangular member having a table-like top portion, flat for the most part, and suitable downwardly extending edge flanges l4 and bracing internal webs. The work positioner comprises a pair of longitudinal ridges interrupted by a cross groove l2, which the abrading disc may enter in cutting off an article resting in the V- shaped channel provided by the ridges. Such an article is indicated at A in Figs. 1 and 2 as a pipe or rod.

The front left hand corner of the base is preferably lowered at l3 to provide space from the operator's hand to grasp the article in the V- shaped work positioner and an upstanding web I forms a thumb guard preventing the thumb of his left hand from reaching the region of the cross grove l2. At the rear, the base carries a pair of ears l6, which form the support for a cross shaft 2| on which the motor-carrying arm 29 is mounted.

The swinging arm is bolted at its forward end to the motor casing 30 to which the handle 60 is secured. The arm, motor frame and handle thus constitute in effect a single rigid member pivoted to the base. As shown in the drawings, the motor frame has an annular boss 32 which is formed in diametrically opposite regions into flat pads 33 and 34. The arm 29 is bolted to the pad 33. The pad 34 receives the handle and carries the casing 10 for the motor switch.

I have mentioned the spring device which i normally holds the arm '30 and the motor in elevated or idle position. This is best shown in Fig. 2. As there appears, this device comprises a downwardly facing cylindrical cup 5! which is vertically slidable in the base, the helical compression spring 52 occupying such cup and seated on a suitable plug 53 screwed into the base. The plug enables adjustment of the spring 52 so that the force of the spring is enough to more than counter-balance the weight of the arm 29 and the motor and other parts carried by the arm, resulting in the arm being normally held in it's uppermost position. In this position a flattened portion 23 (Fig.2) on the arm engages a flattened top of a web between the base standard I6; thereby limiting further upward movement of the arm.

I provide adjustable means to limit the down ward movement of theswinging arm as, for instance, a headed screw 55 threaded in a boss on the base and locked by a jam nut 56.

Coming now to the particular features with which my invention is'concerned, I will first describe the special gearing I employ between the motor 30 and the abrasive disc 40.

The motor has an armature shaft 3| projecting beyond the left hand end of the motor and carrying a driving pinion 39, Figs. 3 and 5. I secure to the end of the frame of the motor 30 a specially formed housing 80 which encloses the pinion 39 and the gear driven thereby and provides a grease: receptacle therefor and also houses the major portion of the abrasive disc 40. This housing is. best shown in Figs. 3, 4 and 5. It has an open outer face normally closed by hinged-cover; BET as hereinafter described. At the inner end the housing is substantially cylindricallasratlill. and" surrounds a positioning boss 31 on the motor frame. I

The inner end of the housing 8fl comprises' anannular thickened portion 82 through WhiClLDfiSS? screws (one of which is shown at 84 in Fig. 3) into the motor frame. The-inner: wallor parti tion; of this: casing is diverted outwardly in.- an approximately'conical forml85 toi.lead to: a fiat region; 86:. parallel with. the plane; bounding the innerpend and'having antannularflatz seat :81 :with its axis-offset from .theaxis'ofthetarmatura shaft 3!.

The motor' preferably has a ventilation casing 38 with air exhaust vents, and the screws 84" which hold the gearcasing to the motor may lie within the ventilation casing and be threaded into the motor frame proper (as indicated in dotted lines in Fig. 3). thus binding all of these members together.

The abrasive disc lil is clamped. on a driven shaft.9llI which is journalledin the housing portion Biiand also in theend of the-motor. frame. L haveshown this journalling as. being effected by a pair. of ball bearings. Thus, thereisa main inner annular raceway 9| snugly surroundingthe shaft 90. Outside of this a cooperating raceway SZ-issecured to thehousing, and-between-the two isa rowof balls 93-preferably embraced by a ball retainer between suitable grease washers. Mounted onthehousing seat 81 is a-ring Sid-which bears against the outer raceway QZ-and is held in the housing by screws 95 and thus' effectively clamps the outer raceway'to the housing while enabling. the removal of this outer raceway with the restof the bearing nd the shaft if desired.

The other. bearing for the driven shaft.comprisesian inner raceway 100 tightv on a reduced extension 96 of the shaft, an outer raceway Iii setinto a recess in the-motor frame against a disc spring I65 and a row. of bails Hi2. between the two-raceways. The bearings: described provide a very efficient anti-frictionsupport for, the driven'shaft 90.

Keyed tothe driven shaft 90 betweenthe two ball bearings is a gear I in meshing withthe pinion 3% on" the. armature shaft. This. gear abuts a collar! H on the shaft;90 and-is:retained.iagainst longitudinal; shifting by "the; inner; raceway: 9|. The extreme diameter: of this .geaitis slightly-less than thesopening'ini the: housing oocupie'dzby the outer; raceway 92. Accordingly; removal of the clampingring 96 :allowsthe-removallas a unitiof the shaft with both of its bearings and thedriven gear. This-providestfor:ready assemblage:of the parts: and likewise for ready removal for" repair and replacement;

The shaft'SO-is providedwithan external thread 961 on. which: is' mounted. a disc: I which is screwed; tight: against: the inner raceway'B i', and

provides an abutment for the abrasive disc 40. This disc has a central opening snugly fitting a. cylindrical portion 91 of the shaft outwardly of the thread 96. Loosely surrounding the shaft on the outer side of the abrasive disc is a metal clamping disc I25 and beyond this is a nut I22 screwing onto a thread 99 on the shaft. The tighteningxof this nut causesthe disc I25 to clamp the abrasive disc 45 against the abutment disc 12!] thereby effectively holding the abrasive disc on the driven shaft but allowing its ready removal by the removal of the nut I22 and the clamping disc I25;

It willbe seen that the bearing and driving provisions-described enable the mounting of the abrasive disc comparatively close to the end of thearmature shaft and the pinion thereon and provide a very accurately journaled readily rotatable driven shaft of short dimensions to carry the driven gear and the disc. As already described the construction enables the ready removal". of the disc from time to time for replacement and the ready removal'ofthe shaft with its bearings and gear whenever necessary without disturbing the housing attached to the motor frame.

If necessary when the shaft with the bearings and gear are withdrawn, the larger hearing may be readily removed over the threaded end of the shaft, and the smaller bearing removed in the opposite direction.

In use, the disc is partially covered. on theouter side by a cover plate I30 hinged at l3l to the housing and having anedge wall I33 abutting the housing and being of substantially cylindrical form for the major portion of its extent; The covering is held to the housing in a region diametrically opposite the hinge by a wing nut I35. screwing onto a bolt I35 hinged to the-housing and in use occupying a notch in the cover. The mere loosening of the wingnut allowsxthe bolt to be swung aside and then the cover swung. to open the-h using, allowing access/to the disc.

In the operation of my abrasivecut-oif machine, a"- continuous shower of sparks results; which pass to the rear of the pipe in the region where the disc is operating. I provide meansto catch the greater part of such incandenscent particles as they pass to the rear of: the'pip'e and immediately quench them, thus producing a, safer and more cleanly operation of thema chine.

The means for quenching the sparks comprises a specia ly formed water trough l 40 mount ed on the frame directly at the rear of the pipe and disc. This water trough comprises a body portion of rectangular form having side walls, end walls and a base, then an open ledge. I45 above the body portion and a hood portion (86 having side walls and a top and rear wall leadingupwardly from. the ledge. The top. wall curves downwardly from an open. front of the hoodfor about a quadrant.

The water trough, as shown, occupies'anopen:- ing IT in the base and is supported by the shoulder or ledge I45 resting on top of; the base, as shown. The trough is adapted to contain water. practically up to the ledge. In operation; the sparks passing rearwardly enter. the; hood and engage the curved top wall-thereof, are immediately deflected downwardly into the water in the trough. This not only effectively quenches the sparksbut collects the flying particles of the disc and article, so that they may be readily discharged.

To form asimple and at the same time effective gauge for the article to be cut, I provide an L-shaped bar I50 slidably mounted in a suitable standard I5I rising from the base and clamped by a thumb screw I52. The standard and car are out of alignment with the V-shaped trough provided by the stationary guides, the standard I5I being preferably back of the line of the article to be cut.

Figs. 1 and 2 indicate at A a. pipe to be cut, this pipe resting in the stationary guides. The L-shaped end portion I55 of the gauge is positioned so that it will be abutted by the end of the pipe and accordingly thus locates the cutting region so that just the desired length oi. the pipe will be cut 011. The gauge may be shifted to vary this distance by merely loosening the thumb screw I52.

If a, longer length of pipe is desired to be cut off than is possible with the gauge extending to the left of the standard I5I as shown, the gauge may be entirely removed from the standard and turned the other end around and inserted from beyond the right hand end of the machine.

The operating handle 60 is preferably a section of pipe screwing at its inner end into the motor casing and carrying at its outer end a suitable hand knob I 60. This enables the ready removal of the handle for shipping or storage purposes.

The switch casing I secured to the pad 34 on the front of a motor frame is a hollow block carrying within it suitable switch mechanism operated by a forwardly projecting finger lever I10. The pad I0 is preferably recessed at the top, as shown at III, so that it may straddle the operating handle screwed into the motor casing and may be removed without disturbing the handle, the switch housing being held in place by four nuts or screws I12 screwing into the housing. The electric supply conductor (not shown) leads to the space within the switch housing I0 preferably from the right hand end of the machine. Any form of switch may be used, but I prefer to employ a switch which opens or closes both leads from the supplying conductor.

I claim:

1. In an abrasive cut-01f machine, the combination of a base having a top portion with edge flange and an upright standard, an arm pivoted to the standard, a motor mounted on the arm, means on the arm for carrying an abrasive disc and means for driving it by the rotation of the armature of the motor, said base having a hole through its top, a removable receptacle for sparks mounted in said hole and having a shoulder engaging the top of the base.

2. In an abrasive cut-01f machine, the combination of a base, an arm pivotally carried thereby, a motor on said arm, means for carrying an abrasive disc operated by the motor, said base having an upwardly open recess and a receptacle for sparks mounted in said recess and comprising a trough with impervious bottom and side and end walls and an outwardly projecting ledge at the top of said trough and a hood extending upwardly from the ledge having side walls and a curved top, said side walls of the hood being materially shorter than the length of the water trough whereby the trough is open upwardly in front of the hood and the hood open at the back of the front edge of the trough.

ROBERT B. PEALER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,730,938 Kleeb et a1 Oct, 8, 1929 1,991,445 Brostrom Feb. 19, 1935 2,014,229 Emmons Sept. 10, 1935 2,031,052 Lewis et al. Feb. 18, 1936 2,107,566 Gardner Feb. 8, 1938 2,354,509 Dreher July 25, 1944 2,388,434 Phillis Nov. 6, 1945 

